Thalictrum flavum (Thalictrum flavum): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Thalictrum flavum work as a bitter tonic?

Thalictrum flavum contains berberine and magnoflorine, alkaloids responsible for its medicinal activity. The bitter compounds stimulate digestive secretions by activating bitter taste receptors in the gut, promoting bile flow and gastric acid production. Berberine, a well-studied isoquinoline alkaloid found in related plants, also exhibits antimicrobial and anti-inflammatory effects. These combined actions explain its traditional use as a digestive bitter and mild laxative (Evidence level: C, Traditional).

Does Thalictrum flavum interact with any medications?

Thalictrum flavum contains berberine, which can inhibit cytochrome P450 enzymes (particularly CYP3A4 and CYP2D6) and P-glycoprotein transporters. This may alter the metabolism and blood levels of various medications, including certain antibiotics, anticoagulants, and immunosuppressants. Due to limited modern research on this specific species, caution is advised when combining with prescription medications. Consult a healthcare provider before use (Evidence level: C).

What is the recommended dosage for Thalictrum flavum?

The traditional adult dosage for Thalictrum flavum is 1-2 grams of dried herb, typically prepared as an infusion or decoction. Due to the presence of berberine and other alkaloids, higher doses should be avoided as they may cause toxicity. This herb has limited modern clinical research, so dosing recommendations are based primarily on traditional use and expert opinion rather than standardized clinical trials (Evidence level: C, Traditional).

Is Thalictrum flavum safe to take during pregnancy?

No, Thalictrum flavum is considered unsafe during pregnancy. The berberine content can stimulate uterine contractions and potentially harm fetal development. Additionally, the herb's laxative effects may cause electrolyte imbalances and dehydration, which pose additional risks during pregnancy. Women who are pregnant or breastfeeding should avoid this herb entirely. Consult a qualified healthcare provider for safe alternatives (Evidence level: C, Traditional).

What are the traditional uses of Thalictrum flavum?

Thalictrum flavum has been used in European folk medicine primarily as a bitter tonic to stimulate digestion and as a gentle laxative. Traditional applications also include fever reduction and general digestive support. The herb contains berberine, magnoflorine, thalictrine, and tannins. However, modern clinical research is limited, and this plant is not commonly used in contemporary herbal practice compared to other berberine-containing species (Evidence level: C, Traditional).

What side effects does Thalictrum flavum cause?

Common side effects of Thalictrum flavum include nausea and gastrointestinal irritation, particularly when taken on an empty stomach or at higher doses. The herb contains alkaloids that may be toxic in large amounts, potentially causing more severe gastrointestinal symptoms. Due to its bitter nature and berberine content, it may also cause stomach cramping or diarrhea in sensitive individuals. Discontinue use if adverse effects occur (Evidence level: C, Traditional).

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 29 PubMed articles · model: gemma4:31b

Summary

Thalictrum flavum, also known as common meadow rue, is a plant species characterized by the biosynthesis of benzylisoquinoline alkaloids (BIAs) [PMID:17900926, PMID:18384289].

Background

Thalictrum flavum (common meadow rue) is a member of the Ranunculaceae family [PMID:20877237]. It serves as a biological source for various benzylisoquinoline alkaloids (BIAs), which are produced via a metabolic pathway involving enzymes such as norcoclaurine synthase (NCS) and norcoclaurine-6-O-methyltransferase (6OMT) [PMID:18384289, PMID:27232113].

Active compounds

The roots of Thalictrum flavum contain several alkaloids, with berberine identified as a major component [PMID:1515054, PMID:20877237]. Other isolated alkaloids include glaucine, thalicsimidine, thaliglucine, thalidazine, hernandezine, thalfoetidine, pseudoberberine, northalfoetidine, northalidasine, northalrugosidine, thaligosidine, thalicberine, thaliglucinone, preocoteine, O-methylcassythine, and armepavine [PMID:1515054, PMID:20877237].

Mechanism of action

The enzyme norcoclaurine synthase (NCS) from T. flavum catalyzes the stereospecific Pictet-Spengler cyclization between dopamine and 4-hydroxyphenylacetaldehyde to produce (S)-norcoclaurine, the precursor for all plant BIAs [PMID:19004827, PMID:18384289]. Hernandezine, a bisbenzylisoquinoline alkaloid from T. flavum, has been shown to induce cancer cell cytotoxicity by activating apoptosis and necroptosis, triggering autophagosome formation via AMPK and ATG5 conjugation systems, and disrupting the lysosomal acidic environment and cathepsin D maturation [PMID:38796213].

Clinical evidence

Evidence DCancer

Hernandezine extracted from T. flavum significantly induced cytotoxicity in cancer cells through apoptosis, necroptosis, and disruption of the lysosomal acidic environment [PMID:38796213]

Evidence DParasitic infections (Leishmaniasis)

Tertiary isoquinolines and bisbenzylisoquinolines from T. flavum roots, specifically thalfoetidine, were found to be leishmanicidal against L. major [PMID:20877237]

Evidence summary

The available evidence is primarily based on in vitro biochemical studies, plant molecular biology, and computational modeling (Level D). There are no clinical trials or systematic reviews provided.

PubMed sources

1.PMID: 19004827 (2009) — Structural basis of enzymatic (S)-norcoclaurine biosynthesis. · The Journal of biological chemistry
2.PMID: 38647611 (2023) — Engineering a norcoclaurine synthase for one-step synthesis of (S)-1-aryl-tetrahydroisoquinolines. · Bioresources and bioprocessing
3.PMID: 17900926 (2007) — High-yield expression and purification of isotopically labeled norcoclaurine synthase, a Bet v 1-homologous enzyme, from Thalictrum flavum for NMR studies. · Protein expression and purification
4.PMID: 18384289 (2008) — Conformation, catalytic site, and enzymatic mechanism of the PR10 allergen-related enzyme norcoclaurine synthase. · The Biochemical journal
5.PMID: 17696451 (2007) — Mechanistic studies on norcoclaurine synthase of benzylisoquinoline alkaloid biosynthesis: an enzymatic Pictet-Spengler reaction.

Thalictrum flavum

Sources & Citations

Calculate a safe dose of Thalictrum flavum

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Frequently asked questions

Summary

Background

Active compounds

Mechanism of action

Clinical evidence

Evidence summary

PubMed sources

Government sources

Thalictrum flavum

Sources & Citations

Calculate a safe dose of Thalictrum flavum

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Rhamnus purshiana

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Frequently asked questions

Summary

Background

Active compounds

Mechanism of action

Clinical evidence

Evidence summary

PubMed sources

Government sources